package com.basic;

import java.util.Scanner;

public class WallBug {

	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		int n = scanner.nextInt();
		int u = scanner.nextInt();
		int d = scanner.nextInt();
		int res = (int) Math.floor(n/(u - d))*2-1;
		
	}

}
